73536

Appears in sequences

• Even triangular numbers with prime indices.at n=39A034955
• Triangular numbers which are 8-almost primes.at n=9A076582
• Triangle read by rows in which the n-th row contains the n smallest triangular numbers with the least significant digits of the n-th triangular number.at n=34A095225
• Triangular numbers for which the number of divisors is also a triangular number.at n=23A116541
• Hexagonal numbers whose number of divisors is also a hexagonal number.at n=10A116565
• Moebius transform of binomial(n+3, 4).at n=34A117109
• Numbers k with the property that it is possible to write the base 2 expansion of k as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have a' * b' = k, where a' and b' are the arithmetic derivatives of a and b.at n=10A259675
• Triangular numbers k such that psi(k) is a square, where psi(k) is the Dedekind psi function (A001615).at n=25A292064
• a(1)=1. For n > 1, a(n) is the n-th positive integer after a(n-1) which cannot be written as a sum of distinct preceding terms in the sequence.at n=19A343017